Remember when you were in grade school, playing some kind of team game and the score was so close? Your side got over the top—and then the most menacing member of the opposition would call, “Do-Over!” It seems that despite whatever advancements the Environmental Protection Agency makes to keep the air clean and the public’s health safe, there will always be those calling for a “do-over.” It’s no longer the bully with the cowlick that always punched the boys or tripped the girls when the teacher wasn’t looking—it’s lobbyists, big coal and oil , those in industry with clout , and all the others...